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3 years ago

5) What is the result of subtracting (x2 + 3x)from the polynomial (-2x2 + 4x + 5)?

Mathematics

2 answers:

Galina-37 [17]3 years ago

8 0

Answer:

- 3x² + x + 5

Step-by-step explanation:

- 2x² + 4x + 5 - (x² + 3x) ← distribute by - 1

= - 2x² + 4x + 5 - x² - 3x ← collect like terms

= - 3x² + x + 5

Alexus [3.1K]3 years ago

3 0

Golden rule to know by heart : you can only add or substract element of the same kind.

so X^2 with X^2 , X with X , numbers with numbers...

exemple : 2X^2 +3X^2 = 5X^2

but 5X^2 -3X remains that way as 5X^2 is a " X^2" and " 3X" is a " X" so I can't substract two elements of different kind.

Now you have to translate what is ask of you into a calculus.

so : you have

A ) ( 2x^2+4x +5) - ( x^2+3x)

Math is a sport of the mind. You will only progress and become stronger if you train.

So I let you have a shot. beware of signs rules. If you still have trouble, ask in comment section..

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3 years ago

Read 2 more answers

Complete the description of the slope of the line that joins the points

Grace [21]

Answer:

The slope of the line that joins the points is negative.

i.e m = -6/5

Step-by-step explanation:

Taking two points from the graph to determine the slope

(-3, 4)

(2, -2)

Finding the slope between (-3, 4),(2, -2)

$\mathrm{Slope}=\frac{y_2-y_1}{x_2-x_1}$ '

$\left(x_1,\:y_1\right)=\left(-3,\:4\right),\:\left(x_2,\:y_2\right)=\left(2,\:-2\right)$

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3 years ago

The EPA wants to know the daily level of pollutant discharge in the manufacturing district in Pittsburgh for February 2005. The

dangina [55]

Answer:

The 95% confidence interval for the true population mean of pollutant discharge is (26.7 tons, 33.7 tons).

Step-by-step explanation:

Let X represent the daily level of pollutant discharge in the manufacturing district in Pittsburgh.

The monitoring equipment reveals that for the 28 days of the February month

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Compute the critical value of t for 95% level of confidence and (n - 1 =) 27 degrees of freedom as follows:

$t_{0.05/2, 27}=2.052$

*Use a t-table.

Compute the 95% confidence interval for the true population mean of pollutant discharge as follows:

$CI=\bar x\pm t_{\alpha/2, (n-1)}\cdot\frac{s}{\sqrt{n}}$

$=30.2\pm 2.052\times\frac{9.1}{\sqrt{28}}\\\\=30.2\pm 3.53\\\\=(26.67, 33.73)\\\\\approx (26.7, 33.7)$

Thus, the 95% confidence interval for the true population mean of pollutant discharge is (26.7 tons, 33.7 tons).

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3 years ago

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iogann1982 [59]

-1/3(x - 15) = -4

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5) What is the result of subtracting (x2 + 3x)from the polynomial (-2x2 + 4x + 5)?​

5) What is the result of subtracting (x2 + 3x)from the polynomial (-2x2 + 4x + 5)?